Of the 420,000 students who take the GRE, many of them are already taking the CAT (Computer-Adaptive Test) version instead--and that number is growing. Because it can be taken any time of the year, the popularity of the test has increased dramatically. The book contains two adaptive paper-and-pencil exams that mirror the CAT format, and "Cracking the GRE CAT with Sample Tests on CD-ROM" provides four additional electronic sample tests that are exactly like the official ETS CAT tests students will take .